Four of your friends are being held in a maximum security jail for a crime they didn't commit. Your job is to break them all out of prison. Can you free them before time runs out?
There are four notched sliding bars that interact in a maze-like fashion. The plexi-glass sides show you the inner working of the puzzle as you solve it. When you free your friends, can you decide what (who?) needs to be put back in jail? Reassembly is just as difficult!
An attractive and fascinating puzzle box that is so good - it's criminal.